LupusNobilis
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ln.dhcp
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Harald Wolff 2019-04-23 12:59:29 +02:00
parent bd73b1c8b2
commit 7304747952
28 changed files with 11363 additions and 62 deletions
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13
BootPPacket.cs
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@ -4,6 +4,7 @@ using ln.types.net;
using ln.types;
using System.Collections.Generic;
using System.IO;
using System.Runtime;
namespace ln.dhcp
{
public enum OP:byte { BOOTREQUEST = 1,BOOTREPLY = 2 }
@ -24,12 +25,12 @@ namespace ln.dhcp
public uint XID { get; set; }
public ushort Secs { get; set; }
public BootPFlags Flags { get; set; }
public IPv4 CIAddr { get; set; }
public IPv4 YIAddr { get; set; }
public IPv4 SIAddr { get; set; }
public IPv4 GIAddr { get; set; }
public IPv4 CIAddr { get; set; } = IPv4.ANY;
public IPv4 YIAddr { get; set; } = IPv4.ANY;
public IPv4 SIAddr { get; set; } = IPv4.ANY;
public IPv4 GIAddr { get; set; } = IPv4.ANY;
public MAC CHAddr { get; set; }
public MAC CHAddr { get; set; } = new MAC(new byte[6]);
public byte[] SName { get; set; }
public byte[] File { get; set; }
@ -99,6 +100,8 @@ namespace ln.dhcp
memoryStream.WriteBytes(YIAddr.IPBytes);
memoryStream.WriteBytes(SIAddr.IPBytes);
memoryStream.WriteBytes(GIAddr.IPBytes);
memoryStream.WriteBytes(CHAddr.Bytes);
memoryStream.WriteBytes(new byte[10]);
memoryStream.WriteBytes(new byte[192]);
memoryStream.WriteBytes(magicVend);

155
DHCPListener.cs 100644
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@ -0,0 +1,155 @@
using System;
using System.Net.Sockets;
using ln.types.net;
using System.Net;
using System.Net.NetworkInformation;
using System.Threading;
using ln.logging;
using System.Text;
namespace ln.dhcp
{
public class DHCPListener
{
public DHCPServer DHCPServer { get; private set; }
public DHCPServerInterface ServerInterface { get; private set; }
public IPv4 InterfaceAddress => ServerInterface.InterfaceAddress;
public InterfaceConfiguration ListeningInterfaceConfiguration { get; private set; }
public IPv4 ListeningAddress { get; private set; }
UdpClient udpClient;
Thread listenerThread;
public DHCPListener(DHCPServer dhcpServer,DHCPServerInterface serverInterface)
{
DHCPServer = dhcpServer;
ServerInterface = serverInterface;
ListeningInterfaceConfiguration = FindNetworkInterface(InterfaceAddress);
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
SetupWindows();
else
SetupLinux();
}
public void Start()
{
if (((listenerThread == null) || !listenerThread.IsAlive) && (ListeningInterfaceConfiguration != null))
{
listenerThread = new Thread(() => InterfaceListener());
listenerThread.Start();
}
}
public void Close()
{
udpClient.Close();
}
public InterfaceConfiguration FindNetworkInterface(IPv4 interfaceAddr)
{
NetworkInterface[] networkInterfaces = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface networkInterface in networkInterfaces)
{
foreach (UnicastIPAddressInformation addressInformation in networkInterface.GetIPProperties().UnicastAddresses)
{
if (interfaceAddr.Equals(addressInformation.Address))
{
return new InterfaceConfiguration(networkInterface.Name, addressInformation.Address, addressInformation.IPv4Mask);
}
}
}
return null;
}
private void SetupWindows()
{
if (ListeningInterfaceConfiguration == null)
return;
ListeningAddress = ListeningInterfaceConfiguration.BroadcastAddress;
}
private void SetupLinux()
{
if (ListeningInterfaceConfiguration == null)
return;
ListeningAddress = IPAddress.Any;
}
private void FixupSocket()
{
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
{
IntPtr socket = udpClient.Client.Handle;
byte[] ifName = Encoding.ASCII.GetBytes(ListeningInterfaceConfiguration.Name);
int result = Mono.Unix.Native.Syscall.setsockopt(
(int)socket,
Mono.Unix.Native.UnixSocketProtocol.SOL_SOCKET,
Mono.Unix.Native.UnixSocketOptionName.SO_BINDTODEVICE,
ifName,
ifName.Length
);
}
}
private void InterfaceListener()
{
udpClient = new UdpClient(new IPEndPoint(ListeningAddress, 67));
udpClient.EnableBroadcast = true;
FixupSocket();
try
{
Logging.Log(LogLevel.INFO, "InterfaceListener started: {0}", ServerInterface.InterfaceAddress);
while (true)
{
IPEndPoint remoteEndpoint = new IPEndPoint(IPAddress.Any, 0);
byte[] rxBytes = udpClient.Receive(ref remoteEndpoint);
Logging.Log(LogLevel.INFO, "RX: {0} {1}", ServerInterface.InterfaceAddress,BitConverter.ToString(rxBytes));
BootPPacket bootPPacket = new BootPPacket(rxBytes, remoteEndpoint);
Logging.Log(LogLevel.INFO, "RX: {0} {1}", ServerInterface.InterfaceAddress, bootPPacket);
DHCPServer.Pool.Enqueue(() => DHCPServer.Received(ServerInterface, bootPPacket));
}
}
catch (Exception e)
{
Logging.Log(LogLevel.WARNING, "DHCPServer.InterfaceListener(): Caught exception: {0}", e);
}
Logging.Log(LogLevel.INFO, "InterfaceListener stopped: {0}", ServerInterface.InterfaceAddress);
lock (this)
{
udpClient.Dispose();
listenerThread = null;
}
}
public void Send(byte[] packet,IPEndPoint remoteEndpoint)
{
Logging.Log(LogLevel.INFO, "DHCPListener: Send(): {0} {1}", remoteEndpoint, BitConverter.ToString(packet));
udpClient.Send(packet, packet.Length, remoteEndpoint);
}
public class InterfaceConfiguration
{
public String Name;
public IPv4 Address;
public IPv4 Netmask;
public Network4 Network => new Network4(Address, Netmask);
public IPv4 BroadcastAddress => Network.Last;
public InterfaceConfiguration(String name,IPv4 address,IPv4 netmask)
{
Name = name;
Address = address;
Netmask = netmask;
}
}
}
}

92
DHCPServer.cs
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@ -17,7 +17,7 @@ namespace ln.dhcp
public string StoragePath { get; private set; }
public bool IsStarted { get; private set; }
Pool pool = new Pool(8);
public Pool Pool { get; private set; } = new Pool(8);
ODBCollection<DHCPServerInterface> interfaces;
public DHCPServerInterface[] Interfaces => interfaces.ToArray();
@ -31,8 +31,9 @@ namespace ln.dhcp
ODBCollection<DHCPLease> leases;
public DHCPLease[] Leases => leases.ToArray();
Dictionary<DHCPServerInterface, DHCPListener> listeners = new Dictionary<DHCPServerInterface, DHCPListener>();
ODB odb;
Dictionary<IPv4, UdpClient> udpClients = new Dictionary<IPv4, UdpClient>();
FileLogger logLease;
@ -83,29 +84,45 @@ namespace ln.dhcp
}
}
public void EnsureInterface(IPv4 interfaceAddr)
{
foreach (DHCPServerInterface serverInterface in interfaces)
if (serverInterface.InterfaceAddress.Equals(interfaceAddr))
return;
AddInterface(interfaceAddr);
}
public void EnsurePool(String name, IPv4 first, IPv4 last)
{
foreach (IPPool pool in IPPools)
if (pool.Name.Equals(name))
return;
AddPool(new IPPool(name, first, last));
}
private void StartInterface(DHCPServerInterface serverInterface)
{
lock (this)
{
Logging.Log(LogLevel.INFO, "Starting ServerInterface {0}",serverInterface.InterfaceAddress);
if (!udpClients.ContainsKey(serverInterface.InterfaceAddress))
{
Thread iThread = new Thread(() => InterfaceListener(serverInterface,null));
iThread.Start();
}
if (!listeners.ContainsKey(serverInterface))
listeners.Add(serverInterface, new DHCPListener(this, serverInterface));
listeners[serverInterface].Start();
}
}
private void StopInterface(DHCPServerInterface serverInterface)
{
lock (this)
{
if (udpClients.ContainsKey(serverInterface.InterfaceAddress))
udpClients[serverInterface.InterfaceAddress].Close();
if (listeners.ContainsKey(serverInterface))
listeners[serverInterface].Close();
}
}
private void Received(DHCPServerInterface serverInterface,BootPPacket packet)
public void Received(DHCPServerInterface serverInterface,BootPPacket packet)
{
Logging.Log(LogLevel.INFO, "Received: {0}",packet);
@ -129,39 +146,6 @@ namespace ln.dhcp
}
}
}
private void InterfaceListener(DHCPServerInterface serverInterface, UdpClient udp)
{
try
{
Logging.Log(LogLevel.INFO, "InterfaceListener started: {0}",serverInterface.InterfaceAddress);
//udp = new UdpClient(new IPEndPoint(serverInterface.InterfaceAddress, 67));
udp = new UdpClient(new IPEndPoint(IPAddress.Any, 67));
udp.EnableBroadcast = true;
while (IsStarted)
{
IPEndPoint remoteEndpoint = new IPEndPoint(IPAddress.Any, 0);
byte[] rxBytes = udp.Receive(ref remoteEndpoint);
Logging.Log(LogLevel.INFO, "RX: {0}", BitConverter.ToString(rxBytes));
BootPPacket bootPPacket = new BootPPacket(rxBytes, remoteEndpoint);
Logging.Log(LogLevel.INFO, "RX: {0}", bootPPacket);
pool.Enqueue(() => Received(serverInterface,bootPPacket));
}
}
catch (Exception e)
{
Logging.Log(LogLevel.WARNING, "DHCPServer.InterfaceListener(): Caught exception: {0}", e);
}
Logging.Log(LogLevel.INFO, "InterfaceListener stopped: {0}", serverInterface.InterfaceAddress);
lock (this)
{
udpClients.Remove(serverInterface.InterfaceAddress);
udp.Dispose();
}
}
public void AddInterface(IPv4 ip)
{
@ -205,9 +189,10 @@ namespace ln.dhcp
reply.RemoteEndpoint = new IPEndPoint(request.CIAddr, 68);
else if (request.Flags.HasFlag(BootPFlags.BROADCAST))
reply.RemoteEndpoint = new IPEndPoint(IPAddress.Broadcast, 68);
else
else if (!request.YIAddr.Equals(IPv4.ANY))
reply.RemoteEndpoint = new IPEndPoint(request.YIAddr, 68);
else
reply.RemoteEndpoint = new IPEndPoint(IPAddress.Broadcast, 68);
return reply;
}
@ -249,6 +234,14 @@ namespace ln.dhcp
}
}
private void Send(DHCPServerInterface serverInterface,byte[] packet,IPEndPoint remoteEndpoint)
{
if (listeners.ContainsKey(serverInterface))
{
listeners[serverInterface].Send(packet, remoteEndpoint);
}
}
private void SendOffer(DHCPServerInterface serverInterface, DHCPLease lease, BootPPacket request)
{
BootPPacket reply = ConstructReply(serverInterface, request, DHCPMessageType.OFFER);
@ -258,8 +251,7 @@ namespace ln.dhcp
reply.AddOption(new DHCPLeaseTimeOption(lease.ValidThrough));
byte[] replyBytes = reply.ToBytes();
UdpClient udpClient = udpClients[serverInterface.InterfaceAddress];
udpClient.Send(replyBytes, replyBytes.Length, reply.RemoteEndpoint);
Send(serverInterface, replyBytes, reply.RemoteEndpoint);
}
private void SendACK(DHCPServerInterface serverInterface, DHCPLease lease, BootPPacket request)
{
@ -270,16 +262,14 @@ namespace ln.dhcp
reply.AddOption(new DHCPLeaseTimeOption(lease.ValidThrough));
byte[] replyBytes = reply.ToBytes();
UdpClient udpClient = udpClients[serverInterface.InterfaceAddress];
udpClient.Send(replyBytes, replyBytes.Length, reply.RemoteEndpoint);
Send(serverInterface, replyBytes, reply.RemoteEndpoint);
}
private void SendNAK(DHCPServerInterface serverInterface, BootPPacket request)
{
BootPPacket reply = ConstructReply(serverInterface, request, DHCPMessageType.NAK);
byte[] replyBytes = reply.ToBytes();
UdpClient udpClient = udpClients[serverInterface.InterfaceAddress];
udpClient.Send(replyBytes, replyBytes.Length, reply.RemoteEndpoint);
Send(serverInterface, replyBytes, reply.RemoteEndpoint);
}
private void DHCPRequest(DHCPServerInterface serverInterface, BootPPacket packet)

14
Option.cs
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@ -17,7 +17,6 @@ namespace ln.dhcp
public Option(byte tag)
{
Tag = tag;
Bytes = new byte[0];
}
public Option(byte tag, byte[] bytes)
{
@ -72,7 +71,7 @@ namespace ln.dhcp
{
byte[] b = option.Bytes;
memoryStream.WriteByte(option.Tag);
memoryStream.WriteByte((byte)(b.Length + 2));
memoryStream.WriteByte((byte)(b.Length));
memoryStream.Write(b, 0, b.Length);
}
memoryStream.WriteByte(0xff);
@ -90,7 +89,7 @@ namespace ln.dhcp
AddFactory(0x33, (tag, bytes) => new DHCPLeaseTimeOption(bytes));// Lease Time
AddFactory(0x35, (tag, bytes) => new DHCPMessageTypeOption(bytes[0])); // DHCP Message Type
AddFactory(0x36, (tag, bytes) => new IPv4Option(tag, bytes)); // Server ID
AddFactory(0x36, (tag, bytes) => new DHCPServerIdentifierOption(bytes)); // Server ID
}
}
@ -197,10 +196,15 @@ namespace ln.dhcp
public class DHCPServerIdentifierOption : IPv4Option
{
public DHCPServerIdentifierOption()
: base(53)
: base(0x36)
{ }
public DHCPServerIdentifierOption(byte[] bytes)
: base(0x36)
{
IP = new IPv4(bytes);
}
public DHCPServerIdentifierOption(IPv4 ip)
: base(53, ip)
: base(0x36, ip)
{ }
}

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2
ln.dhcp.csproj
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@ -28,6 +28,7 @@
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="Mono.Posix" />
</ItemGroup>
<ItemGroup>
<Compile Include="DHCPServer.cs" />
@ -38,6 +39,7 @@
<Compile Include="DHCPLease.cs" />
<Compile Include="IPPool.cs" />
<Compile Include="DHCPMessageType.cs" />
<Compile Include="DHCPListener.cs" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\ln.types\ln.types.csproj">

2
obj/Debug/ln.dhcp.csproj.CoreCompileInputs.cache
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@ -1 +1 @@
351cd8cebd3a846083459b35e2cffc1b4dd124b9
62f8061fbf7e671ceaa150fc217748d6af510370

14
obj/Debug/ln.dhcp.csproj.FileListAbsolute.txt
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@ -12,3 +12,17 @@
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/Volumes/HOMES/haraldwolff/src/skyspot/ln.dhcp/obj/Debug/ln.dhcp.csproj.CopyComplete
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/home/haraldwolff/src/ln.skyspot/ln.dhcp/obj/Debug/ln.dhcp.csproj.CoreCompileInputs.cache
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